An integrated assembly fixture for a photoelectric accelerometer pendulum assembly

Abstract

This invention belongs to the field of precision assembly technology for accelerometers, and discloses an integrated assembly fixture for a photoelectric accelerometer pendulum assembly. The base is a rectangular plate structure, with its left and right sides fixed to a first side plate and a second side plate respectively via screws. A first through hole is formed in the center of the base, penetrating both the upper and lower surfaces. A blind hole, coaxial with the first through hole, is also formed on the lower surface of the base, with a diameter larger than the first through hole. A first bracket is rotatably mounted on the upper surface of the first side plate, a second bracket is rotatably mounted on the upper surface of the base and located next to the through hole, and a third bracket is rotatably mounted on the lower surface of the base and located next to the through hole. A first shim supports the pendulum, a second shim is positioned above the pendulum to fix its position and limit the counterweight, a third shim is located on the upper surface of the base plate and next to the through hole near the second side plate, and is used to support a light-blocking plate. A fourth shim is used to fix the torque coil.

Description

Technical Field

[0001] This invention belongs to the field of precision assembly technology of accelerometers, and relates to an integrated assembly fixture for a photoelectric accelerometer pendulum assembly. Background Technology

[0002] The photoelectric accelerometer is a new generation of high-precision flexible accelerometer, currently widely used in various airborne and missile navigation systems. With increasing accuracy requirements and usage, the assembly precision requirements for the pendulum assembly, a key component of the accelerometer, have become more stringent, while the demand for assembly efficiency has also significantly increased. Therefore, the simple pendulum assembly fixture designed during the R&D phase can no longer meet these requirements.

[0003] The pendulum assembly, a key component of photoelectric accelerometers, comprises an SOI silicon pendulum plate, torque coil, coil spacer ring, counterweight mass, light-blocking plate, and upper and lower limit plates. These components are bonded together with adhesive. The pendulum assembly directly senses the angular velocity information during the carrier's motion, requiring extremely high assembly precision. Previous assembly fixtures suffered from drawbacks such as inadequate positioning of critical parts during assembly; excessive reliance on skilled workers' assembly techniques, making human intervention unavoidable and resulting in inconsistent pendulum assemblies assembled by different workers; and low assembly efficiency, requiring different assembly fixtures for different processes, leading to lengthy assembly times. Therefore, with the continuous improvement of accelerometer accuracy and its widespread use in numerous advanced weapons and equipment, designing a high-precision, high-efficiency integrated pendulum assembly fixture is crucial for improving accelerometer accuracy, consistency, and production capacity. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention provides an integrated assembly fixture for the pendulum component of an accelerometer, enabling rapid and precise assembly of the pendulum component, the core component of the accelerometer.

[0005] An integrated assembly fixture for a photoelectric accelerometer pendulum assembly includes: a base 1, a first side plate 2, a second side plate 3, a first bracket 5, a second bracket 6, a third bracket 7, a first gasket 8, a second gasket 9, a third gasket 10, and a fourth gasket 11.

[0006] The base is a rectangular plate structure, and the left and right sides are fixed to the first side plate and the second side plate by screws respectively. A first through hole is opened in the middle of the base, which runs through the upper and lower surfaces of the base. The first through hole is used to avoid the silicon pad ring and the torque coil. A blind hole coaxial with the first through hole is also opened on the lower surface of the base. The diameter of the blind hole is larger than that of the first through hole.

[0007] The first bracket is rotatably mounted on the upper surface of the first side plate; the second bracket is rotatably mounted on the upper surface of the base and located next to the through hole; the third bracket is rotatably mounted on the lower surface of the base and located next to the through hole; the three brackets have similar structures, all being L-shaped, with a vertical spring pin through hole at the front end of the bracket.

[0008] The first gasket is disposed on the upper surface of the base plate and located next to the through hole and close to the first side plate. The first gasket is used to support the swing plate. During assembly, the first spring pin passes through the spring pin through hole on the first bracket to fix the upper limit plate.

[0009] The second shim is placed above the swing plate to fix the position of the swing plate. At the same time, a rectangular groove is opened at the front end to limit the counterweight. During assembly, the second spring pin passes through the spring pin through hole on the second bracket to fix the second shim.

[0010] The third pad is located on the upper surface of the base plate and next to the through hole, close to the second side plate. The third pad is used to support the light-blocking sheet.

[0011] The fourth washer is placed between the torque coil and the third bracket, and the fourth washer is used to fix the torque coil; the third spring pin passes through the spring pin through hole on the third bracket to fix the fourth washer.

[0012] Furthermore, the fixture also includes: a positioning pin 4;

[0013] The upper surface of the base has a positioning groove, and the positioning pin is set in the positioning groove. The positioning pin is used to simultaneously position the lower limit piece, the swing piece and the upper limit piece during assembly.

[0014] Furthermore, the base is also provided with a first threaded hole perpendicular to the positioning pin, and the screw is screwed into the first threaded hole to fix the positioning pin and prevent it from loosening.

[0015] Furthermore, each bracket has a second threaded hole at its front end that is perpendicular to the spring pin through hole. A screw passes through the second threaded hole to fix the spring pin and prevent it from loosening.

[0016] Furthermore, the first gasket and the lower limiting piece have the same thickness.

[0017] Furthermore, the thickness of the third pad is equal to the sum of the thicknesses of the lower limit pad and the swing pad.

[0018] Furthermore, the second pad has a rectangular groove for limiting the position of the counterweight.

[0019] Furthermore, the second gasket is a roughened transparent glass sheet.

[0020] Further investigation revealed that the fourth gasket was a transparent glass sheet.

[0021] Furthermore, the fixture also includes a bracket, which consists of two rectangular plates; both sides of the upper and lower surfaces of the first and second side plates are provided with recessed steps, and the bracket and the recessed steps cooperate to raise the fixture.

[0022] The present invention has the following effects:

[0023] The integrated assembly fixture for the photoelectric accelerometer pendulum assembly provides precise positioning for the assembly of the pendulum assembly, reduces the influence of human factors, greatly increases the consistency of the assembled pendulum assembly, and significantly reduces the amount of deformation; at the same time, it takes into account the processability and speed of assembly, and one set of fixtures can complete the assembly of all processes, which greatly improves the assembly efficiency. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the integrated assembly fixture in an embodiment of the present invention. Figure 1 ;

[0025] Figure 2 This is a three-dimensional schematic diagram of the integrated assembly fixture in an embodiment of the present invention. Figure 2 ;

[0026] Among them, 1-base, 2-first side plate, 3-second side plate, 4-positioning pin, 5-first bracket, 6-second bracket, 7-third bracket, 8-first gasket, 9-second gasket, 10-third gasket, 11-fourth gasket, 12-bracket, 13-swing plate, 14-torque coil, 15-silicon pad ring, 16-counterweight, 17-light blocking plate, 18-upper limit plate, 19-lower limit plate. Detailed Implementation

[0027] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, specific details are set forth for purposes of explanation rather than limitation, in order to help to fully understand the present invention.

[0028] It should be noted that, in order to avoid obscuring the invention with unnecessary details, only structures closely related to the solution according to the invention are shown in the accompanying drawings, while other details that are not closely related to the invention are omitted.

[0029] The assembly of the photoelectric accelerometer pendulum assembly mainly consists of three steps: The first step is to bond the upper limit plate 18 and the lower limit plate 19 to the pendulum plate 13. This step requires high positional accuracy of the limit plates. Importantly, after installation, a high-precision rangefinder must be used to measure the distance between the upper limit plate 18 and the lower limit plate 19 and the pendulum plate 13. The second step is to bond the counterweight 16 and the light-blocking plate 17 to the pendulum plate 13 respectively, ensuring that the counterweight 16 and the light-blocking plate 17 do not deflect. The third step is to bond the silicon pad ring 15 and the torque coil 14 to the reverse side of the pendulum plate 3. The pendulum plate needs to be flipped before installation. At the same time, it is important to ensure that the front side of the pendulum plate 3 is supported so that the pendulum plate 3 will not break under pressure during the bonding process.

[0030] The solutions for the components of the integrated assembly fixture for the photoelectric accelerometer pendulum assembly provided by this invention are as follows:

[0031] The base 1 has threaded holes on both its left and right sides, which are fixed to the first side plate 2 and the second side plate 3 by screws, respectively. Furthermore, a first through hole is formed in the middle of the base 1, penetrating both the upper and lower surfaces, to allow space for the torque coil 14 and the silicon washer ring 15. Additionally, a blind hole coaxial with the first through hole is formed on the lower surface of the base 1. The diameter of the blind hole is larger than that of the first through hole. When the base 1 is flipped over, the installation positions of the torque coil 14 and the silicon washer ring 15 can be directly observed from the lower surface of the base 1, with sufficient operating space. Furthermore, the upper surface of the base 1 has a positioning groove, and the positioning pin 4 is set in the positioning groove for simultaneously positioning the lower limit piece 19, the swing piece 13 and the upper limit piece 18 during assembly; furthermore, the base 1 also has a first threaded hole perpendicular to the positioning pin 4. When assembling the upper limit piece 18 and the lower limit piece 19 with the swing piece 13, the screw is screwed into the first threaded hole and tightened to fix the positioning pin 4. When it is necessary to measure the distance between the upper limit piece 18 and the lower limit piece 19 and the swing piece 13, the thread is loosened and the positioning pin 4 is removed to leave room for observation.

[0032] A threaded hole is opened in the center of the upper end face of the first side plate 2, and the first bracket 5 can be rotatably connected to the first side plate 2 by screws; furthermore, the upper and lower end faces of the first side plate 2 and the second side plate 3 are both recessed to a certain height to be placed on the bracket 12.

[0033] The second bracket 6 can be rotatably connected to the upper end face of the base 1 by screws, and the third bracket 7 can be rotatably connected to the lower end face of the base 1 by screws; furthermore, the front ends of the first bracket 5, the second bracket 6 and the third bracket 7 are all vertically opened with circular through holes and horizontally opened with threaded holes. The through holes are used to insert the spring pin, and the threaded holes can lock the spring pin.

[0034] The first pad 8 and the lower limit pad 19 are of the same thickness and are used to support the swing plate to be in a straight state.

[0035] The thickness of the third pad 10 is the sum of the thicknesses of the lower limit plate 19 and the swing plate 13, and it is used to support the light-blocking plate.

[0036] The second shim 9 is pressed on the pendulum plate to fix the position of the pendulum plate. The front end of the second shim 9 has a rectangular groove to limit the counterweight 16. Furthermore, the second shim 9 is preferably made of roughened transparent glass. Roughening is to prevent the second shim 9 from sticking to the pendulum plate 13 after they are pressed together. Transparency is to allow clear observation of the position of the pendulum plate 13 during the assembly process and to prevent the position of the pendulum plate 13 from deflecting.

[0037] The fourth shim 11 is used to fix the position of the torque coil 14 and the silicon washer ring 15; furthermore, the fourth shim 11 is preferably made of transparent glass to facilitate clear observation of the position of the torque coil 14 and the silicon washer ring 15 and to prevent deflection.

[0038] The specific implementation of the present invention is as follows:

[0039] Preparation: First, fix the base plate 1 to the first side plate 2 and the second side plate 3 with screws. Once fixed, it does not need to be disassembled repeatedly. Next, glue the first gasket 8 and the third gasket 10 to the first base 1. They will not be disassembled again. Then, fix the first bracket 5 to the first side plate 2 with screws. Fix the second bracket 6 and the third bracket 7 to the upper and lower ends of the base 1 with screws. At this time, the screws do not need to be tightened when fixing the three brackets. The brackets can be rotated to make room for the assembly of the component parts.

[0040] The first step of assembling the pendulum assembly is as follows: First, insert the positioning pin 4 into the corresponding positioning slot of the base 1 and fix the positioning pin 4 with screws; then, place the lower limit plate 19, which has been coated with adhesive, on the base 1, and use the positioning pin 4 and the first side plate 2 to uniquely define the position of the lower limit plate 19; next, place the pendulum piece 13 on the lower limit plate 19, and use the positioning pin 4 and the first side plate 2 to uniquely define the position of the pendulum piece 13, with the front end of the pendulum piece 13 supported by the first washer 8; next, place the upper limit plate 18, which has been coated with adhesive, on the pendulum piece 13, and use the positioning pin 4 and the first side plate 2 to uniquely define the position of the upper limit plate 18. The first bracket 5 is then rotated to the designated position, and the screws connecting the first bracket 5 and the first side plate 2 are tightened. Then, the spring pin is inserted through the circular through hole at the front end of the first bracket 5 and placed on the center of the upper limit plate 18. The spring pin is then tightened with screws, so that there is a certain locking force between the swing plate 13 and the upper limit plate 18 and the lower limit plate 19, ensuring that their adhesion is stable. After the adhesive has cured, the screws fixing the positioning pin 4 are loosened, the positioning pin 4 is pulled out, and then the distance between the upper limit plate 18, the lower limit plate 19 and the swing plate 13 is measured using a high-precision rangefinder.

[0041] The second step of assembling the pendulum assembly is as follows: First, the second pad 9 is placed uniquely above the pendulum plate 13. Then, the second bracket 6 is rotated to the designated position, and the screws connecting the second bracket 6 and the base 1 are tightened. Next, the spring pin is inserted through the circular through hole at the front end of the second bracket 6, and placed against the center of the second pad 9. The spring pin is then tightened with screws. Next, the counterweight 16 is applied with glue and placed in the rectangular groove at the front end of the second pad 9. The rectangular groove serves to limit the position of the counterweight 16. Then, the light-blocking plate 17 is applied with glue and inserted into the groove of the counterweight 16. The front end of the light-blocking plate 17 is supported by the third pad 10.

[0042] The third step of assembling the pendulum assembly is as follows: First, flip the base 1 over and place the first side plate 2 and the second side plate 3 on the bracket 12. The hollow design of the bracket 12 is to allow space. Next, apply adhesive to the silicone pad ring 15 and place it on the lower end face of the pendulum plate 13. Apply adhesive to the torque coil 14 and place it on the silicone pad ring 15. Then, place the fourth washer 11 above the torque coil 14 and rotate the third bracket 7 to the designated position. Tighten the screws connecting the third bracket 7 and the base 1. Then, insert the spring pin through the circular through hole at the front end of the third bracket 7, press it against the center of the fourth washer 11, and tighten the spring pin with screws. After the adhesive has completely cured, loosen the screws fixing the spring pins on the three brackets (without removing them), remove the spring pins, and remove the second washer 9 and the fourth washer 11. Then loosen the screws fixing the three brackets and rotate the three brackets to one side. Finally, simply remove the assembled pendulum assembly.

[0043] The integrated assembly fixture for the photoelectric accelerometer pendulum assembly provided by this invention offers precise limits for the dimensions and fit requirements of each part of the pendulum assembly, greatly reducing the impact of human factors. This significantly increases the consistency of the assembled pendulum assembly and significantly reduces deformation. Furthermore, the fixture balances assembly processability and speed, taking into account all steps of the pendulum assembly process. It achieves multi-step installation with a single integrated fixture, avoiding repeated disassembly and reassembly, and greatly shortening the assembly time. This provides a way for the mass assembly of accelerometers.

Claims

1. An integrated assembly fixture for a photoelectric accelerometer pendulum assembly, characterized in that: The clamp includes: a base (1), a first side plate (2), a second side plate (3), a first bracket (5), a second bracket (6), a third bracket (7), a first gasket (8), a second gasket (9), a third gasket (10), and a fourth gasket (11). The base is a rectangular plate structure, and the left and right sides are fixed to the first side plate and the second side plate by screws respectively. A first through hole is opened in the middle of the base, which runs through the upper and lower surfaces of the base. The first through hole is used to avoid the silicon pad ring and the torque coil. A blind hole coaxial with the first through hole is also opened on the lower surface of the base. The diameter of the blind hole is larger than that of the first through hole. The first bracket is rotatably mounted on the upper surface of the first side plate; the second bracket is rotatably mounted on the upper surface of the base and located next to the through hole; the third bracket is rotatably mounted on the lower surface of the base and located next to the through hole; all three brackets are L-shaped, and the front end of the bracket has a vertical spring pin through hole. The first gasket is disposed on the upper surface of the base plate and located next to the through hole and close to the first side plate. The first gasket is used to support the swing plate. During assembly, the first spring pin passes through the spring pin through hole on the first bracket to fix the upper limit plate. The second shim is placed above the swing plate to fix the position of the swing plate. At the same time, a rectangular groove is opened at the front end to limit the counterweight. During assembly, the second spring pin passes through the spring pin through hole on the second bracket to fix the second shim. The third pad is located on the upper surface of the base plate and next to the through hole, close to the second side plate. The third pad is used to support the light-blocking sheet. The fourth washer is placed between the torque coil and the third bracket, and the fourth washer is used to fix the torque coil; the third spring pin passes through the spring pin through hole on the third bracket to fix the fourth washer.

2. The clamp according to claim 1, characterized in that: The fixture also includes: a positioning pin (4); The upper surface of the base has a positioning groove, and the positioning pin is set in the positioning groove. The positioning pin is used to simultaneously position the lower limit piece, the swing piece and the upper limit piece during assembly.

3. The clamp according to claim 2, characterized in that: The base is also provided with a first threaded hole perpendicular to the positioning pin, and the screw is screwed into the first threaded hole to fix the positioning pin and prevent it from loosening.

4. The clamp according to claim 1, characterized in that: Each bracket has a second threaded hole at its front end that is perpendicular to the spring pin through hole. Screws pass through the second threaded hole to fix the spring pin and prevent it from loosening.

5. The clamp according to claim 1, characterized in that: The first gasket has the same thickness as the lower limit plate.

6. The clamp according to claim 1, characterized in that: The thickness of the third pad is equal to the sum of the thicknesses of the lower limit pad and the swing pad.

7. The clamp according to claim 1, characterized in that: The second pad has a rectangular groove for limiting the position of the counterweight.

8. The clamp according to claim 7, characterized in that: The second gasket is a roughened transparent glass sheet.

9. The clamp according to claim 1, characterized in that: The fourth gasket is a transparent glass sheet.

10. The clamp according to claim 1, characterized in that: The clamp also includes a bracket, which consists of two rectangular plates; both sides of the upper and lower surfaces of the first and second side plates are provided with recessed steps, and the bracket and the recessed steps cooperate to raise the clamp.

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